… 75 Self-Sealing Cardboard Mailers Highest Quality and Value (4.5″ x 6.5″) Product Specifications: Dimensions: 4.5″ x 6.5″Thickness: 250 GSM (.010″) Quantity: 75 Pieces Additional Details: Self-sealing, peel and stick, adhesive keeps contents secure and tamper proofExtremely durable and lightweight cardboard material helps save on postageProvides bend resistance Surface easily accepts ink, stamps, and labelsApproved for USPS, FedEx, UPS, and DHL Retail Price: $52